To solve the equation: x minus half plus one tenth equals nine tenths

To solve the equation: x minus half plus one tenth equals nine tenths

x-1/2+1/10=9/10
x-(1/2-1/10)=9/10
x-(5/10-1/10)=9/10
x-4/10=9/10
x-2/5=9/10
x=9/10+2/5
x=9/10+4/10
x=13/10